Certain materials can become superconductors under what conditions?

a. When it is very hot

c. Under very high pressure

b. When it is very cold

d. Under very low pressure

A laptop can convert 400J of electrical energy into a 240J of light and sound. What is the efficiency? Where does the rest of the energy go?

How long does water evaporation take? What factors influence it?

If two different sized objects have the same density, what can you conclude about the object?

And ice cream truck is going 25 m/s to the east it accelerates to 40 m/s in the same direction over three seconds what is it acceleration

Convert 420 kg of lead to cm3

What is the recommended daily dosage of flouride for a child over three years of age living in an area where drinking water is free fluoride

Use the drop-down menus to complete the sentences. A thin wire has MORE resistance than a thick wire. A short wire has LESS resistance than a long wire. A warm wire has MORE resistance than a cool wire.

A book on a shelf 2.0 meters above the floor has a mass of 1.5 kilograms. what is the gravitational potential energy of the book

Which of the following is true about natural selection? A.) It occurs extremely rapidly B.) It can always be observed within a single generation C.) It causes mutations to occur D.) It causes more useful traits to be passed to offspring

Three ways to increase the potential difference across a lamp without changing the power supply.